Improved shippers for shifting belts



' guide being placed in a position near to the said pulleys.

iguith tetes gettoni pffr'a.

THOMAS' w. FROST, or DoaonnsTER., ASSIGNOR To HIMSELEAND'J. B.

KENDA'LLOF MILTON, MASSACHUSETTS.

.Lesers faam-N0. 76,739, daad Win14, l186e.

IMPnovno snrrrsns ron 'entsinne BELTS.

TO ALL WHOMIT MAY` CONCERN v ,Bc it known that I, THOMAS W. FROST', of Dorchester, in the county oi- Norfolk, and VState of ltz'tseac'hu.- sette, have invented' certain Improvements in Shippers for Shifting Belts, of which the following'is a'fnll, clear,A

and exact. description, reference beinghad'to the accompanying drawings, making part of this'speciiication, in which-- l i Figure 1 is a perspective view, illustrating my improved shipper in a position for throwing a belt from a fast to a loose pulley. l I

Figure 2 is a transverse vertical section through the same.

vliigmre' is a4 transverse vertical section, in which the shipper is shown in a position for throwing the belt from the loose to the fast pulley. A I Figure 4 is a horizontal section, on the lines :o a: of gs. 2 and 3.

The means ordinarily employed for shifting belts froinffust to loose pulleys, or vice versa, are objectionable for the reason that considerable time is occupied in the-operation--a very serious objection in case of thev disarrangement of the machinery, or ivlxere'the life or limb of an individ'nal is endangered by coming in contact,"

land being entangled with the running-gear. To remove the above-mentioned objection is the purpose of myinvention, which consists in a guide, made in one or more-pieces, and Iattached to a bar orrod which is made to slide in a direction at or nearly at right angles to the belt, by operating anordinary lever, or otherwise; the.

To enable others skilled in the art to understand and use my invcnti ner -in which I havel carried it o ut.

In the said drawings, A represents the floor of any 'room occupied by shafting; B is one ofthe beams, and

C C are upright standards, extending between it and the door. L

' To the side ofthe standards C C are secured bearings, a a, which support the ends of a shaft, D, upon which are placed, side by side, a fast pulley, E, and a loose pulley, F. G G are'two standards, rising from the on, I will proceed to describethe man1 floor A. To the tops of these standardsI are secured bearings, b b, fm` the driving-.shaft H to revolve in. One

extremity of this shaft vH projects outside its standard G, and is providcdwith a drum or cylinder, I, over which,

. and the fast pulley E, is carried a bclt,`K, which thus communicates motion to the latter.` L is a. shipper or lever, the upper end of which is pivoted, at c, to the beam B. This shipper L'passes down through a slot, d, formed in a horizontal bar, M, to lugs ol,on the ander side of which it isxsecured by a pin, e. The ends, f,'of

,the bar M pass through slots cut in the upper portion of the' standards C C, and the bar is thus free to slide in either direction'by operating thehandl'e, g, of the shipper, Vwhich extends down within reaching. distance of the floor. To the under sidc of the sliding bar M is secured a guide, N, made in two pieces, h t', of the form vshown in section, figs. 2 and 3i Within this guide runs the belt K, which is'prevented from beingthrown olf the pulley which it drivcs'by coming in contact with the inside of one of the pieces h the curvature of which isisuch that it ares inward from .the points 'l tothe point m at its centre, (see iig. 4,) so that the edge of the belt comes in contact therewith at this point only, thereby materially reducing the friction, .and preventing much of the wear incident to the ordinary form of shippers; Y I

` The curvature of the portion h, from the centre, in, downward in -the same vertical plane to a point, ,gs,

2 and 3,'is such that the belt may be shifted vinstantly from the fast to-the loose pulley bythe surfacem 'n n being brought up against the edge, o, of the belt, which is caused to ride up toward the centre, m, while'itlie edged), of the belt is depressed, and slides readily down on to' the loose pulley Fof a smaller diameter than the fast pulley E, and stopping the machine to which it is attached. When itis required to start the Work again, it'iis simply necessary to pressthc shipper L in thedirection of the arrow v5, when the curved' portion of the piece t', from r tom, is brought against the edge p of the belt, depressing it and raising the edge, as-

required, so as to allow it to ride upward on thc'periphery of the fastpulley E, the' curvature of thepiece r',

from 1 to m,'inelining downward and outward, and the point 1 first strikingthe edge 1J of, the belt, so as to guide y Vit downward, as the incline i' m passes over it, (iig. 3.) Where the diameter of the fast pulley is much larger than that oi' the loose pulley, the incline 1' m should commence lower down than that shown, and the degree of its curvature should be increased ormade'sharper in order to give a greater cant upward to the edge o ofthe belt, and thus insure its being readily throw'n upon the pulleyfE. I

In case of any accident oceui'ring\\'l1ich requires the immediat-e stoppage ofthe work, the shipper may be pressedilthe direction of the arrow 6, so as to bring the piece 7L against the edge ofthe belt, and thus instantly shift it o'n to the loose pulley F, (fig. 2.)

In :L variety of machines an unexpected resistance to the power or'inc'reased strain is brought upon the belt, which `has e. tendency to be thrown oti'its fast pulley, which tendency, however, -is eiiectuellycounteraoted by my improved guide, the curvature of its interior being such as to bring the belt back to its norml position,

as required.

It is evident that the guide N may he formed in one piece instead of' in two, as shown, without departing from the spirit of' my invention.

Claim.

WhatI claim as my invention, and desire to secure by Letters Patent, s The within-'described guide N, formed in one or more pieces, and secured to a sliding bar, M, for giving the belt a lateral inclination, as end for the purpose set forth.

THOMAS W. FROST.

Witnesses N. W. SrEARNs, W. J. Caumnen. 

